JPS624789Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separation-preventing pipe joint, and more particularly to a pipe joint having a locking ring that prevents the socket from being pulled out of the socket.

For example, in a pipe joint that has a sealing part in which a sealing material is positioned at the open end of the socket and the sealing material is pressed by a press ring or the like to fit between the socket and the socket, the socket is inserted into the socket. Conventionally, when installing a lock ring to prevent it from being pulled out of the mouth,
For example, as in Japanese Patent Application Laid-Open No. 58-113318, a lock ring in an annular groove formed on the inner peripheral surface of the socket is pressed from outside the socket with a set bolt to fit into the socket, and this lock ring and the outer circumference of the socket are connected. It was customary to engage a stepped portion provided in the

However, in this type of pipe joint, because the seal material is pressed by a pressure ring or the like in the seal portion, the lock ring is located closer to the tip of the insertion port, i.e., closer to the back end of the socket, than the seal portion, and there is a risk of fluid leaking from the threaded portion of the set bolt. Moreover, when joining the socket and the insertion port, it is necessary to thread and adjust each of the multiple set bolts around the socket outer periphery, which results in poor efficiency of work.

Therefore, the object of the present invention is to eliminate the pressing operation of the lock ring using the set bolt, thereby preventing leakage of fluid within the pipe and improving work efficiency.

For this reason, the present invention can be inserted into the socket annular groove formed on the inner periphery of the socket, and the socket annular groove formed on the outer periphery of the socket opposite to this socket annular groove. At the same time, it is divided into an appropriate number of parts in the circumferential direction,
A lock ring with an uneven split end,
It is affixed to the split ends of the lock ring, and is filled between the split ends of the lock ring so that it is flush with the outer surface of the lock ring. A rubber elastic body is provided on the bottom surface of the groove to be pressed and held.

Therefore, it is possible to eliminate the conventional pressing operation of the lock ring using a set bolt, thereby making it possible to prevent fluid leakage within the pipe and improve work efficiency.

Hereinafter, embodiments of the present invention will be described based on the drawings. Figures 1 to 3 show the first embodiment, Figure 1 is a longitudinal sectional view thereof, Figure 2 is a side view showing the lock ring and elastic body before assembly, and Figure 3 is an enlarged view of the main parts. FIG.

1 to 3, a tapered surface 2 is formed at the opening of the socket 1, and an annular sealing material 3 is positioned therein. On the other hand, T-head bolts 5 pass through multiple locations in the circumferential direction of the tightening flange 4 formed at the tip of the socket 1, and a nut 6 screwed onto the T-head bolt 5 passes through a press ring 7. The sealing material 3 is pressed toward the tapered surface 2 and the outer peripheral surface of the insertion port 8. The seal portion 9 is configured in this way, and seals between the socket 1 and the socket 8. Note that 10 and 11 are cement mortar linings applied to the inner surface of the tube.

A socket annular groove 12 is formed on the inner periphery of the socket 1 on the back side of the tapered surface 2, and a socket annular groove 13 is formed on the outer periphery of the socket 8 facing the socket annular groove 12. Reference numeral 14 denotes a lock ring made of a material having sufficient strength to prevent the lock ring from falling off, such as metal or plastic. It is formed. 18 is each end 1
It is an elastic body made of rubber that is attached to the ends 6 and 17 by baking or the like and is filled between both ends 16 and 17. In this way, the lock ring 14 and the elastic body 1
8 is integrally molded.

When joining the socket 1 and the socket 8, the lock ring 14 is first placed in the socket annular groove 12, and the push ring 7 and the sealing material 3 are loosely fitted into the socket 8. Next, insert the socket 8 into the socket 1 with the lock ring 14 expanded in diameter, and insert the socket annular groove 13 as shown in FIG.
Insert the lock ring 14 into the lock ring 14. Then, the lock ring 14 is biased in the direction of diameter reduction by the elasticity of the elastic body 18, and the bottom surface 1 of the annular groove 13 is pressed against the lock ring 14.
9, thereby forming a lock portion 20 with a detachment prevention function.
In addition, when the lock ring 14 is divided into one piece in the circumferential direction as in this embodiment, the lock ring 14
It is possible to apply a biasing force to reduce the diameter thereof, thereby increasing the pressing force against the bottom surface 19 of the insertion annular groove 13 and improving the detachment prevention function.

FIG. 4 shows a second embodiment, and FIG. 5 shows a third embodiment. That is, FIG. 4 shows the end portion 2 of the divided portion 25 of the lock ring 24.
6 and 27 are formed into concave shapes and are molded integrally with the elastic body 28, and FIG. In addition, the periphery thereof is shown covered with a sheath-like elastic body 38.

As described above, the pipe joint according to the present invention is equipped with a detachment prevention function, but the most commonly used mechanical joints that do not have a detachment prevention function are lock rings 14 and 2 compared to the above-mentioned present invention.
4, 34 and the insertion annular groove 13 are not provided. Therefore, on the contrary, when manufacturing the detachment prevention pipe joint according to the present invention, an annular groove 1 is formed on the outer periphery of the mechanical joint socket.
3 by cutting or the like, and the above-mentioned lock rings 14, 24, and 34 need only be disposed. That is, for example, when the tube body is molded by centrifugal casting, the detachment prevention joint and the mechanical joint can be molded in a common mold, and only the machining of the insertion annular groove 13 and the presence or absence of the lock rings 14, 24, 34 are required. It can be used for both of the above joints, and costs can be reduced.

As described above, according to the present invention, the action of the elastic body integrally molded with the lock ring makes it possible to apply a biasing force in the direction of diameter reduction to the lock ring, eliminating the need for a conventional set bolt, thereby preventing fluid leakage in the pipe. Not only can this be prevented, but the screw adjustment work of the set bolt can be eliminated, improving reliability and workability.In addition, the rubber elastic body is filled so that it is flush with the outer surface of the lock ring, making it easier to lock the lock ring. The lock ring can be made into a circumferentially continuous annular body, making it easy to handle, and the lock ring can also be kept in a predetermined cross-sectional shape even at the split portion, making it easy to fit into the socket annular groove and the insertion annular groove. Good fitting performance can be achieved, and since the split end of the lock ring is formed into an uneven shape and the elastic body is pasted, the pasting area becomes larger and good sticking performance can be ensured. can.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a side view showing the lock ring and elastic body before assembly, and FIG. 3 is a side view thereof. FIG. 4 is an enlarged plan view of the main part, the lock ring part in FIG. 1 is a cross-sectional view of FIG. 3, and FIG. FIG. 5 shows a third embodiment of the present invention, b is an enlarged plan view of its essential parts, and a is a cross-sectional view of b. DESCRIPTION OF SYMBOLS 1... Socket, 3... Annular sealing material, 8... Socket, 9... Seal part, 12... Socket annular groove, 13
... Socket annular groove, 14, 24, 34 ... Lock ring, 15, 25, 35 ... Divided part, 16, 1
7, 26, 27, 36, 37... end, 18, 2
8, 38...Elastic body, 20...Lock part.

Claims (1)

[Scope of utility model registration request] In a pipe joint that has a seal portion having a sealing material press-fitted between a socket and an insertion port, and a lock portion that prevents the insertion port from being pulled out from the socket, the lock portion is connected to the inner periphery of the socket. a socket annular groove formed in the socket, and a socket annular groove formed on the outer periphery of the socket opposite to the socket annular groove, and a socket which can be fitted across both the annular grooves and formed in an appropriate number in the circumferential direction. A lock ring which is divided and whose divided ends are formed in an uneven shape, and a lock ring which is attached to the divided ends of this lock ring, and which extends between the divided ends of this lock ring so that it is flush with the outer surface of this lock ring. 1. A detachment-preventing pipe joint characterized in that it is comprised of a rubber elastic body which is filled with a rubber material and which biases the lock ring to reduce its diameter and press and hold the lock ring against the bottom surface of the annular groove of the insertion opening.